2001 North Indian Ocean cyclone season

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2001 North Indian Ocean cyclone season
2001 North Indian Ocean cyclone season summary.png
Season summary map
Seasonal boundaries
First system formedMay 21, 2001
Last system dissipatedNovember 12, 2001
(January 1, 2002 per JTWC)
Strongest storm
Name ARB 01
  Maximum winds215 km/h (130 mph)
(3-minute sustained)
  Lowest pressure932 hPa (mbar)
Seasonal statistics
Depressions6, 1 unofficial
Deep depressions4, 1 unofficial
Cyclonic storms4, 1 unofficial
Severe cyclonic storms1
Very severe cyclonic storms1
Extremely severe cyclonic storms1
Total fatalities108 total
Total damage$104 million (2001 USD)
Related articles
North Indian Ocean tropical cyclone seasons
1999, 2000, 2001, 2002, 2003

The 2001 North Indian Ocean cyclone season was fairly quiet, although activity was evenly spread between the Arabian Sea and the Bay of Bengal. There were six depressions tracked by the India Meteorological Department (IMD), which is the official Regional Specialized Meteorological Center for the northern Indian Ocean. The agency also tracked four cyclonic storms, which have maximum winds of at least 65 km/h (40 mph) sustained over 3 minutes. The American-based Joint Typhoon Warning Center (JTWC) tracked an additional storm Tropical Storm Vamei which crossed over from the South China Sea at a record-low latitude.

Contents

The first storm originated on May 21, and became the strongest recorded storm in the Arabian Sea at the time. The IMD estimated peak 3 minute winds of 215 km/h (135 mph) while the storm was off the west coast of India. The storm weakened greatly before making landfall in Gujarat, and although impact on land was minor, it left up to 950 fishermen missing. A few weeks later, the first Bay of Bengal system originated a short-lived depression that dropped heavy rainfall upon striking Odisha. After a period of inactivity during the monsoon season, [1] there were cyclonic storms in September and October in the northern Arabian Sea. Both lasted only a few days and dissipated due to unfavorable wind shear. Another cyclonic storm formed in the Bay of Bengal and struck Andhra Pradesh, which dropped heavy rainfall that was equivalent to 300% of the average October precipitation total. The rains caused flooding, particularly in Cuddapah, where a dam was deliberately opened and inundated the town overnight. There were 153 deaths due to the storm and RS5 billion (Indian rupees, US$104 million) in damage. The final storm of the season tracked by the IMD was a short-lived depression in November in the Bay of Bengal.

Season summary

Tropical Storm Vamei2001 India cyclone2001 North Indian Ocean cyclone season

The India Meteorological Department (IMD) in New Delhi the official Regional Specialized Meteorological Center for the northern Indian Ocean as recognized by the World Meteorological Organization issued warnings for tropical cyclones developing in the region. The basin's activity is sub-divided between the Arabian Sea and the Bay of Bengal on opposite coasts of India, and is generally split before and after the monsoon season. The IMD utilized satellite imagery to track storms, [2] and used the Dvorak technique to estimate intensity. [1]

Toward the end of the year, convection was generally lower than normal in the Bay of Bengal, despite being a typical hotspot for activity. There were no deaths or damage throughout the year outside of India, and damage there was lower than what occurred in the previous few seasons. [2]

Systems

Extremely Severe Cyclonic Storm ARB 01

Extremely severe cyclonic storm (IMD)
Category 3 tropical cyclone (SSHWS)
ARB 01 2001-05-23 Terra.jpg   Cyclone 01A 2001 track.png
DurationMay 21 – May 28
Peak intensity215 km/h (130 mph) (3-min);
932  hPa  (mbar)

The first storm of the season originated from a tropical disturbance that formed east of Somalia on May 18. Over the following few days, the system gradually organized, [3] becoming a depression on May 21. It moved eastward toward the coastline of southwestern India and rapidly intensified on May 22, strengthening from a deep depression to a very severe cyclonic storm within 24 hours. [1] After approaching the coastline, the storm turned to the north and northwest away from land due to a ridge. [3] Based on the well-defined eye and the storm's satellite presentation, [1] the IMD estimated peak winds of 215 km/h (135 mph) on May 24, and the JTWC estimated 1 minute winds of 205 km/h (125 mph). [4] It became the strongest storm on record in the Arabian Sea, only to be surpassed by Cyclone Gonu in 2007. [5] Soon after reaching peak intensity, the cyclone rapidly weakened as it turned northward. By May 28, it had deteriorated into a deep depression, and the IMD downgraded the storm to a remnant low before the circulation reached the Gujarat coast. [4]

Ahead of the storm, all ports in Gujarat, including Kandla, one of the largest in the country, were closed as a precautionary measure. [6] Over 10,000 people were evacuated from coastal areas in the threatened region. Offshore, between 1,500 and 2,000 fishing vessels lost contact with the mainland immediately after the storm. [7] However, because the storm remained offshore, the coast only experienced minor damage, although rainfall was widespread. [1] About 200 houses were washed away in Kosamba, [3] and one person died in Jamnagar. [1] About 950 fishermen were missing after the storm, which prompted a helicopter search. [8]

Cyclonic Storm ARB 02

Cyclonic storm (IMD)
Tropical storm (SSHWS)
ARB 2001-09-26 Terra.jpg   Cyclone 02A 2001 track.png
DurationSeptember 25 – September 28
Peak intensity65 km/h (40 mph) (3-min);
1000  hPa  (mbar)

An upper-level disturbance spawned a low-pressure area in the eastern Arabian Sea on September 24. [1] It initially consisted of a well-defined circulation on the eastern edge of an area of convection about 370 km (230 mi) west-southwest of Mumbai. With low wind shear beneath the subtropical ridge, the system gradually organized and developed curved banding features while moving west-northwestward. [9] At 0900 UTC on September 24, the IMD classified the system as a depression, and nine hours later upgraded it further to a deep depression. [1] On the same day, the JTWC issued a Tropical Cyclone Formation Alert, although they did not begin advisories due to the center being on the east side of the convection. [9] At 0900 UTC on September 25, the IMD upgraded the system to a cyclonic storm, [1] estimating peak winds of 65 km/h (40 mph). [10]

Early on September 26, the circulation moved beneath the convection, prompting the JTWC to begin advisories on Tropical Cyclone 02A. [9] Around that time, the storm's outskirts dropped light rainfall in western India. [1] Forecasters initially anticipated that the storm would strengthen to winds of 95 km/h (60 mph) and strike the southern Arabian Peninsula. However, persistent wind shear dislocated the circulation from the convection and imparted weakening. [9] The IMD downgraded the storm to a deep depression and later depression on September 27, [1] by which time the thunderstorms were rapidly dwindling. The JTWC issued their last advisory on September 28 after the circulation had no nearby convection. At that time, the storm was located 185 km (115 mi) east-southeast of Masirah Island off Oman. [9] The IMD also downgraded the depression to a low-pressure area on September 28 and noted that the remnant system became poorly defined the following day. [1]

Cyclonic Storm ARB 03

Cyclonic storm (IMD)
Tropical storm (SSHWS)
Tropical Cyclone 03A 09 oct 2001 0555Z.jpg   Cyclone 03A 2001 track.png
DurationOctober 7 – October 13
Peak intensity65 km/h (40 mph) (3-min);
998  hPa  (mbar)

Similar to the previous storm, an area of convection formed in the Arabian Sea about 185 km (115 mi) west-southwest of Mumbai on October 7. It was associated with a circulation that moved westward from the Indian Coast, [11] which formed as a well-defined low-pressure area over western India. [1] The convection organized and increased, aided by low wind shear and good outflow. [11] Late on October 8, the IMD classified the system as a depression, and early the next day upgraded it to a deep depression. [1] A low-level circulation formed beneath a well-defined mid-level storm, with intense convection and strong winds north of the center. At 06:00 UTC on October 9, the JTWC began classifying the system as Tropical Cyclone 03A. [1]

With increasing banding features, the storm strengthened while moving west-northwestward, steered by a ridge to the north. [1] At 09:00 UTC that day, the IMD upgraded the system to a cyclonic storm, estimating peak winds of 65 km/h (40 mph). [1] Soon thereafter, the storm began weakening due to increased dry air and the upper-level environment becoming unfavorable. The thunderstorms diminished and disappeared over the circulation by October 10. That day, the JTWC discontinued advisories, [11] and the IMD downgraded it to a remnant low-pressure area south of Pakistan. The storm brushed the Indian coast with rainfall, reaching 105 mm (4.1 in) in Gujarat state, although there was no major damage. [1]

Cyclonic Storm BOB 02

Cyclonic storm (IMD)
BOB storm 15 oct 2001 0520Z.jpg   BOB02 2001 track.png
DurationOctober 14 – October 17
Peak intensity65 km/h (40 mph) (3-min);
998  hPa  (mbar)

Early on October 14, a low-pressure area formed off the eastern coast of India. While moving generally westward, the system quickly organized into a depression that day. [1] On October 15, the IMD estimated peak winds of 65 km/h (40 mph), [12] based on satellite imagery appearance warranting a Dvorak rating of 2.5; this made it a cyclonic storm. [1] However, the circulation remained removed from the deep convection. [13] Early on October 16, the storm made landfall near Nellore, Andhra Pradesh. It quickly weakened over land, degenerating into a remnant low-pressure area over Rayalaseema on October 17. [1]

While moving ashore, the storm dropped heavy rainfall in Andhra Pradesh and extending into Tamil Nadu, [1] causing flooding in some areas for the first time in 40 years. [14] In a 24‑hour period, Sullurpeta recorded 261 mm (10.3 in) of precipitation, and 13 stations recorded daily totals of over 100 mm (4 in); [1] the highest two-day rainfall total was 676.5 mm (26.63 in), and some areas received 300% of the average October rainfall within 36 hours. [14] Damage was heaviest in Andhra Pradesh, particularly in Nellore, Chittoor, and Kadapa, [1] although floods also extended into Bihar. Several regional roads and rail lines were damaged, including portions of National Highway 5, which stranded hundreds of trucks; the routes were reopened within two weeks. [14] The rains breached 1,635 water tanks, while 125,000 ha (310,000 acres) of crop fields, mostly rice and groundnuts, were impaired. About 1,000 head of cattle were killed as well. [1] In Cuddapah, excess water was released from irrigation dams along the Buggavanka River; water levels rose 1.5 m (4.9 ft) in the middle of the night, catching residents off guard, and damaging 18,244 houses. The dam was also breached in Nellore, and many towns in the region were inundated or isolated for two days. [14] Across the state, the storm damaged 55,747 houses, accounting for RS5 billion (Indian rupees, US$104 million) in losses. [1] There were 153 deaths related to the floods and the storm, mostly in Cuddapah. [14]

Following the storm, the Indian Red Cross Society used funds related to previous floods and an earthquake to help 2,000 families. [15] After the floods, the Indian government provided food and housing to 61,681 residents in 130 shelters, and distributed 20 kg of rice to each household. The army flew helicopters to drop off food, candles, and kerosene to stranded families in Cuddapah. Stagnant waters were disinfected after the floods, and deceased cattle were burned to reduce infection. [14]

Other systems

Satellite image of the November depression east of India Tropical Cyclone 04B 11 nov 2001 0809Z.jpg
Satellite image of the November depression east of India

For several days in June, the JTWC monitored a disturbance in the northern Bay of Bengal for potential development, [16] associated with the southwest monsoon. [2] On June 9, a low-pressure area formed, and it became well-defined by June 11. [1] By that time, there was convection located west of an exposed circulation. [16] Early on the following day, the IMD classified it as a depression, [1] estimating peak winds of 45 km/h (30 mph). [17] Strong wind shear prevented much development. [16] Shortly after forming, the system moved northwestward and made landfall near Paradip, Odisha. It quickly weakened below depression intensity on June 13 while progressing inland, degenerating into a remnant low near Madhya Pradesh on June 15. The system dropped heavy rainfall along its path, with a daily peak of 350 mm (14 in) in Vidarbha. [1]

On November 7, a cycling area of convection was persistent off the east coast of India, associated with a broad circulation embedded within a trough. The thunderstorms expanded and gradually organized, aided by good outflow and low wind shear. [13] On November 11, the IMD upgraded the system to a depression off the coast of Tamil Nadu and Andhra Pradesh. [1] On the same day, the JTWC began classifying the depression as Tropical Cyclone 04B. Located within a weakness of the ridge, the depression moved slowly to the north and northeast, and was initially expected to move ashore. However, increasing shear removed the convection from the center, and the storm remained offshore while weakening. [13] On November 12, the IMD downgraded the system back to a low-pressure area. The storm brought rainfall to coastal portions of eastern India, peaking at 150 mm (5.9 in) in Paradip. [1]

The near-equator Tropical Storm Vamei crossed Sumatra from the South China Sea at the end of December. According to the Japan Meteorological Agency the official agency covering the western Pacific Ocean the storm weakened into a remnant low on December 28, along the east coast of Sumatra. On the next day, the remnants entered the Bay of Bengal, and thunderstorms soon reformed over the circulation due to weak to moderate wind shear. After the remnants of Vamei regenerated, the JTWC classified it as Tropical Cyclone 05B on December 30, although the agency later treated it as a continuation of the original storm. Moving west-northwest, the storm re-intensified to a secondary peak of 65 km/h (40 mph). However, an increase in wind shear left the circulation center exposed. Vamei quickly weakened, dissipating early on January 1, 2002. [18] [19] The IMD never tracked the storm. [1]

Season effects

This is a table of all storms in the 2001 North Indian Ocean cyclone season. It mentions all of the season's storms and their names, duration, peak intensities (according to the IMD storm scale), damage, and death totals. Damage and death totals include the damage and deaths caused when that storm was a precursor wave or extratropical low, and all of the damage figures are in 2001 USD.

NameDatesPeak intensityAreas affectedDamage
(USD)
DeathsRefs
Category Wind speedPressure
ARB 01 May 21–28Extremely Severe Cyclonic Storm215 km/h (135 mph)932 hPa (27.52 inHg)Western India Minimal 900
BOB 01June 12–13Depression45 km/h (30 mph)990 hPa (29.23 inHg)East India Minimal
ARB 02September 25–28Cyclonic Storm65 km/h (40 mph)1,000 hPa (29.53 inHg)None None None
ARB 03October 7–13Cyclonic Storm65 km/h (40 mph)998 hPa (29.47 inHg)Western India None None
BOB 02October 14–17Cyclonic Storm65 km/h (40 mph)998 hPa (29.47 inHg)Southeast India None None
BOB 03November 11–12Depression45 km/h (30 mph)1,004 hPa (29.65 inHg)India Minimal
Season aggregates
6 systemsMay 21 –January 1 215 km/h (135 mph)932 hPa (27.52 inHg)

See also

Related Research Articles

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<span class="mw-page-title-main">Tropical Storm Vamei</span> Pacific and North Indian tropical cyclone in 2001

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<span class="mw-page-title-main">Cyclone Agni</span> North Indian Ocean severe cyclonic storm in 2004

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<span class="mw-page-title-main">2002 North Indian Ocean cyclone season</span> Cyclone season in the North Indian Ocean

The 2002 North Indian Ocean cyclone season was a below average season in terms of tropical cyclone formation. The season had no official bounds, but most storms formed in either May or after October. No depressions or storms formed during the monsoon season from July to September, the first such instance on record. There are two main seas in the North Indian Ocean – the Bay of Bengal to the east of the Indian subcontinent – and the Arabian Sea to the west of India. The official Regional Specialized Meteorological Centre in this basin is the India Meteorological Department (IMD), while the Joint Typhoon Warning Center (JTWC) releases unofficial advisories. An average of four to six storms form in the North Indian Ocean every season with peaks in May and November. Cyclones occurring between the meridians 45°E and 100°E are included in the season by the IMD.

<span class="mw-page-title-main">2000 North Indian Ocean cyclone season</span> Cyclone season in the North Indian ocean

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<span class="mw-page-title-main">1998 North Indian Ocean cyclone season</span> Cyclone season in the North Indian ocean

The 1998 North Indian Ocean cyclone season was an active season in annual cycle of tropical cyclone formation. The season has no official bounds but cyclones tend to form between April and December. These dates conventionally delimit the period of each year when most tropical cyclones form in the northern Indian Ocean. There are two main seas in the North Indian Ocean—the Bay of Bengal to the east of the Indian subcontinent and the Arabian Sea to the west of India. The official Regional Specialized Meteorological Centre in this basin is the India Meteorological Department (IMD), while the Joint Typhoon Warning Center releases unofficial advisories. An average of four to six storms form in the North Indian Ocean every season with peaks in May and November. Cyclones occurring between the meridians 45°E and 100°E are included in the season by the IMD.

<span class="mw-page-title-main">1993 North Indian Ocean cyclone season</span> Cyclone season in the North Indian Ocean in 1993

The 1993 North Indian Ocean cyclone season was the least active on record in the basin, with only four tropical disturbances. There are two main seas in the North Indian Ocean – the Bay of Bengal to the east of the Indian subcontinent and the Arabian Sea to the west. The India Meteorological Department (IMD) issued advisories for the systems in its official capacity as the local Regional Specialized Meteorological Center, while the Joint Typhoon Warning Center also issued advisories for two of the storms on an unofficial basis. Of the five disturbances tracked by the IMD, two intensified into cyclonic storms.

<span class="mw-page-title-main">1994 North Indian Ocean cyclone season</span>

The 1994 North Indian Ocean cyclone season was a below-average year in which eight tropical cyclones affected seven countries bordering the North Indian Ocean. The India Meteorological Department tracks all tropical cyclones in the basin, north of the equator. The first system developed on March 21 in the Bay of Bengal, the first March storm in the basin since 1938. The second storm was the most powerful cyclone of the season, attaining maximum sustained winds of 215 km/h (135 mph) in the northern Bay of Bengal. Making landfall near the border of Bangladesh and Myanmar, the cyclone killed 350 people and left US$125 million in damage.

<span class="mw-page-title-main">1998–99 South-West Indian Ocean cyclone season</span> Cyclone season in the Southwest Indian Ocean

The 1998–99 South-West Indian Ocean cyclone season was a quiet season that had the fourth-lowest number of days with tropical storm or tropical cyclone activity. Most of the storms formed either in the Mozambique Channel or in the far eastern portion of the basin, with five storms crossing from the adjacent Australian basin east of 90° E. As a result, few storms impacted Madagascar, and none made landfall on the African continent. Throughout most of the season, there was below-normal sea surface temperatures in the Indian Ocean east of Madagascar. In February, typically the peak in activity, Réunion island recorded its highest average monthly pressure since 1953. Due to generally unfavorable conditions, there were only six tropical storms tracked by the Météo-France office (MFR) on Réunion. There were only two tropical cyclones – a storm with winds of at least 120 km/h (75 mph).

<span class="mw-page-title-main">2009 North Indian Ocean cyclone season</span> North Indian Ocean tropical cyclone season

The 2009 North Indian Ocean cyclone season was an event in the annual cycle of tropical cyclone formation. The North Indian Ocean cyclone season has no official bounds, but cyclones tend to form between April and December, with peaks in May and November. These dates conventionally delimit the period of each year when most tropical cyclones form in the northern Indian Ocean.

<span class="mw-page-title-main">2000 South India cyclone</span> Cyclonic Storm in the North Indian ocean in 2000

The 2000 South Indian Cyclone was the strongest, most intense tropical cyclone of the fairly-quiet 2000 North Indian Ocean cyclone season. The fifth cyclone, and the fourth named storm, Extremely Severe Cyclonic Storm BOB 05 started as an upper-level low over the Andaman Sea on November 24. On early November 26, the group of thunderstorms was classified as a depression by the IMD. The system slowly began to organize, and late on November 26 the JTWC named it as Tropical Cyclone 03B. By November 28, a 20 km (12 mi)-wide eye was developing, prompting the JTWC to upgrade the storm to the equivalent of a minimal hurricane with winds of 120 km/h (75 mph). By comparison, the IMD estimated peak winds of 190 km/h (120 mph). Wind shear in the region prevented further strengthening, and the storm weakened slightly before making landfall on November 29 in eastern India near Cuddalore. A station there recorded a pressure of 983 mbar (29.0 inHg).

References

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